[time-nuts] Description - GR 1120-AB Frequency Standard

Jim Hall perseidjh at hotmail.com
Thu Sep 4 02:06:32 UTC 2008


Russ,

Sorry but the only thermoswitches he has or knows about are for 60 or 70 
degrees C units he has.  I think he got his switches from GR crystal ovens 
used for BC transmitters.  I imagine their requirements were less stringent 
than the "standards lab" standard you are rebuilding but then again you 
never know.

Most of the thermoswitches he has were manufactured by "Precision" or at 
least that was written on each of them.  Another thermoswitch was 
manufactured by "H inside a diamond, B inside a diamond".  I think both the 
GR thermoswitches were manufactured by Precision.  I wonder if you could 
search on eBay or other sites for that name if that is who manufactured 
yours.  Probably a long shot but just wondering.

Jim



--------------------------------------------------
From: <wa3frp at aol.com>
Sent: Wednesday, September 03, 2008 7:55 PM
To: <time-nuts at febo.com>
Subject: Re: [time-nuts] Description - GR 1120-AB Frequency Standard

> Jim,
>
> Thanks for following up on this.  The thermoswitch that I'm looking for
> closes on reaching a trip temperature of 78C.  The original unit was
> made by Princo. I wonder if your friend could tell me if he has any
> leads on a 78C thermoswitch.
>
> Thanks again,
>
> Russ
>
>
>
>
>
>
>
> -----Original Message-----
> From: Jim Hall <perseidjh at hotmail.com>
> To: time-nuts at febo.com
> Sent: Wed, 3 Sep 2008 8:04 pm
> Subject: [time-nuts] Description - GR 1120-AB Frequency Standard
>
>
>
> Today I visited a friend who collects all sorts of old electronics and
> asked him
> about mercury thermometer sensors.  Turns out he had several from
> various GR
> pieces of equipment.  Some are in a straight shape with "trip"
> temperatures of
> 50 or 60 degrees C.  One is at a 90 degree angle with a 60 degree C
> trip point.
> I'm sure it is a very long shot but I wondered if any of these might
> work for
> the frequency standard you are rebuilding.
>
> Most of the above temperature sensors were built by "Precision".  I
> have the
> part numbers.
>
> What do you think?  Does it sound like any of these could be
> replacements for
> your unit?
>
> Regards,
>
> Jim
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